Cis Ocp V190 4.1.8

CIS Red Hat OpenShift Container Platform Benchmark v1.9.0 - Control 4.1.8

Profile Applicability

• Level: 1

Description

Ensure that the certificate authorities file ownership is set to root:root.

Rationale

The certificate authorities file controls the authorities used to validate API requests. You should set its file ownership to maintain the integrity of the file. The file should be owned by root:root.

Impact

None.

Audit Procedure

The Client CA location for the kubelet is defined in /etc/kubernetes/kubelet.conf and is /etc/kubernetes/kubelet-ca.crt by default.

Run the following command to view the user and group ownership:

for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
do
oc debug node/${node} -- chroot /host stat -c %U:%G /etc/kubernetes/kubelet-ca.crt
done

OR

for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
do
oc debug node/${node} -- chroot /host stat -c %U:%G /host/etc/kubernetes/kubelet-ca.crt
done

Verify that the ownership is set to root:root.

Remediation

None.

Default Value

By default, in OpenShift 4, the --client-ca-file is set to /etc/kubernetes/kubelet-ca.crt with ownership root:root.

References

1. https://docs.openshift.com/container-platform/latest/architecture/control-plane.html#understanding-machine-config-operator_control-plane
2. https://kubernetes.io/docs/reference/access-authn-authz/authentication/#x509-client-certs

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 1 (Automated)